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POTATO INVESTIGATIONS LABORATORY
Mimeo Report POL 67-1 October 1966
FERTILIZER PLACEMENT FOR CABBAGE PRODUCTION
D. Ri Hensel, Assoc. Soils Chemist & Head
Cabbage tends to respond to fertilizer side dressing applications. In the
past the general recommendation was 1800 pounds of 6-8-8, or equivalent, applied
at planting and 2-3 side applications of nitrogen and potassium. The root system
of cabbage tends to be less vigorous and efficient than other vegetables, there-
fore, to get maximum production, the fertilizer level in the soil has to be main-
tained at a high level. In view of these facts, it was proposed that a different
response and greater fertilizer efficiency could be obtained if the basic amount
of fertilizer was not applied all at one time.
The following experiment studied three rates of application and four methods
of placement. In addition, two hybrids, Market Topper and King Cole, were used
as the test crop. The rates of application were 1200, 1800, and 2400 pounds of
6-8-8 per acre or equivalent. Methods of fertilizer application included:
(1) All at planting.
(2) 3/4 at planting and 1/4 in 3 weeks.
(3) 1/2 at planting and 1/4 at 3 and 6 weeks.
(4) 1/4 at planting and 1/4 at 3, 6, and 9 weeks after planting.
Two additional side dressing applications of 30 pounds of nitrogen and
potassium were made during the growing season over the entire experiment.
Results in the following graph show the total yield response to the various
fertilizer treatments. When all the fertilizer was applied at planting, the
yield differences were small. A definite increase in yield was observed when
the 2400 pound application was split. The maximum yield was obtained when 1200
pounds of 6-8-8 or equivalent (same amount of nutrients) was applied at planting
and 600 pounds applied at 3 and 6 weeks later. Early yield data showed similar
results to fertilizer application. Differences between King Cole and Market
Topper were not significant. These results agree very well with the same experi-
ment in 1964-1965 using Marion Market as the test variety. In view of this evi-
dence, the fertilizer recommendation for cabbage is 1200 pounds of 6-8-8, or
equivalent, applied at planting. Two applications of 600 pounds of 6-8-8 are to
be applied at 3 and 6 weeks after planting. In addition, follow normal side-
dressing applications of nitrogen and potassium which are 2-3 applications of
30-40 pounds each. Number of sidedressings should vary with rainfall and length
of season. After heavy rains, extra nitrogen and potassium will be needed.
YIELD RESPONSE TO FERTILIZER PLACEMENT
0- --0 =
Fertilizer Proportion Applied at Planting.